Why does the machine gun always miss? I love when hundreds of rounds of ammunition miss the target!
I also love a good detective movie, where the detective tells his partner "the vic died by being shot from 9mm"... fast forward some, then they find the murder "weapon", confirm is the "murder weapon"... but it's a .357 on screen!!
I don't know about you, but when I have a nightmare, I never stay in bed, kind of open my eyes lazily and think: "that was bad". No, sir. I ALWAYS sit-jump upright with this terrified look on my face.
You forgot you've been sweating like hell because this nightmare has lasted forever so you actually sit-jump upright with this terrified look on your face, soaked wet as if you had just run a marathon but since you're a pig and your wife doesn't give a s... how you stink you just go back to sleep without changing your pajamas or at least going to the washroom to cold wash your face.
Why, when being chased by some unknown evil, do they always fall down?
Laptop computers that can interface with alien technology and defeat it (think ID4) or the hero just plugs into the evil overloard's network and immediatly has full and unfettered access. I work in IT and when I setup a new user or a user's new computer, if I don't have everything right, I can't get the computer onto the domain.
To this date, no spaceship has successfully developed a technology capable of being silent, even if it's stationed. They are very very noisy.
The psychopath/ruthless villain/just damn bad guy with a reason. "Alright, [insert name of standard hero character here], finally I have you right where I wanted. I'm going to throw you down this 48th floor, but first... I'm going to tell you a story of how I was an abused child and I'm on a mission to kill everyone out there 'cause my mom refused to get me a vanilla ice cream when..." It's like, KILL THE FRIGGING GUY ALREADY!